import uuid

from fastapi import Depends

from common.database.db_session_manager import DB_SESSION_MNG
from common.database.model.models import users
from common.enums import DBWRType, ErrorType, UserRole, UserStatus
from common.utils.gtime import GTime
from crud.user_crud import IUserCRUD, UserCRUD
from router.v1.company.protocol import (
    CompanyUserData,
    Req_CreateCompanyUser,
    Req_UpdateCompanyUser,
    Res_CompanyUser,
    Res_CompanyUserList,
    Res_DeleteCompanyUser,
)
from router.v1.validator.dependencies import GetHashedPW


class CompanyUserService:
    """최고관리자(OWNER)의 자기 회사 유저 관리 로직.

    - 라우터에서 RequireOwner 로 1차 권한을 거른 뒤 호출된다.
    - company_id 는 토큰값만 쓴다(요청 body 무시) → 남의 회사 데이터 불가.
    - 변경 대상이 OWNER 면 거부한다(최고관리자는 앱에서 수정·삭제 불가).
    """

    def __init__(self, user_crud: IUserCRUD = Depends(UserCRUD)):
        self.user_crud = user_crud

    async def _fetch_managed(self, company_uuid: uuid.UUID, user_id: uuid.UUID):
        """대상 유저 조회 + 같은 회사 + 비-OWNER 확인. (ErrorType, user|None) 반환."""
        err_type, user = await DB_SESSION_MNG.execute_lambda(
            users.DBType(),
            DBWRType.DB_READ.value,
            lambda s: self.user_crud.get_by_user_id(s, user_id),
        )
        if err_type != ErrorType.SUCCESS or user is None:
            return ErrorType.ACCOUNT_NOT_FOUND, None
        if user.company_id != company_uuid:
            return ErrorType.ACCOUNT_NOT_FOUND, None
        if user.role == UserRole.OWNER.value:
            return ErrorType.ACCOUNT_FORBIDDEN, None
        return ErrorType.SUCCESS, user

    async def list_users(self, company_id: str, search, pg, hide_dev: bool = False) -> Res_CompanyUserList:
        res = Res_CompanyUserList(page=pg.page, size=pg.size)
        company_uuid = uuid.UUID(company_id)

        err_type, rows, total = await DB_SESSION_MNG.execute_lambda(
            users.DBType(),
            DBWRType.DB_READ.value,
            lambda s: self.user_crud.list_by_company(s, company_uuid, search, pg.skip, pg.size, hide_dev),
        )
        if err_type != ErrorType.SUCCESS:
            res.result.SetResult(err_type)
            return res
        res.users = [CompanyUserData.model_validate(r) for r in rows]
        res.total = total
        return res

    async def get_user(self, company_id: str, user_id: str) -> Res_CompanyUser:
        res = Res_CompanyUser()
        err_type, user = await self._fetch_managed(uuid.UUID(company_id), uuid.UUID(user_id))
        if err_type != ErrorType.SUCCESS:
            res.result.SetResult(err_type)
            return res
        res.user = CompanyUserData.model_validate(user)
        return res

    async def create_user(self, company_id: str, req: Req_CreateCompanyUser) -> Res_CompanyUser:
        res = Res_CompanyUser()
        company_uuid = uuid.UUID(company_id)

        # 1) 로그인 ID 중복 확인 (id 는 전역 unique)
        err_type = await DB_SESSION_MNG.execute_lambda(
            users.DBType(),
            DBWRType.DB_READ.value,
            lambda s: self.user_crud.is_user(s, req.id),
        )
        if err_type == ErrorType.DB_ALREADY_SAME_KEY:
            res.result.SetResult(ErrorType.ACCOUNT_ALREADY_EXIST)
            return res
        if err_type != ErrorType.SUCCESS:
            res.result.SetResult(err_type)
            return res

        # 2) 생성 — 회사는 토큰값. 권한은 일반·관리자만 허용(최고관리자 승격은 앱에서 불가).
        user = users(
            company_id=company_uuid,
            id=req.id,
            password=await GetHashedPW(req.password),
            name=req.name or None,
            email=req.email or None,
            contact_number=req.contact_number or None,
            role=req.role if req.role in (UserRole.USER.value, UserRole.OWNER.value) else UserRole.USER.value,
        )
        err_type = await DB_SESSION_MNG.execute_lambda_run(
            [users.DBType()],
            [lambda s: self.user_crud.add_user(s, user)],
        )
        if err_type != ErrorType.SUCCESS:
            if err_type == ErrorType.DB_ALREADY_SAME_KEY:
                res.result.SetResult(ErrorType.ACCOUNT_ALREADY_EXIST)
            else:
                res.result.SetResult(err_type)
            return res

        # 서버 기본값(created_at 등)은 insert 후 객체에 안 실리므로 재조회.
        return await self.get_user(company_id, str(user.user_id))

    async def update_user(self, company_id: str, user_id: str, req: Req_UpdateCompanyUser) -> Res_CompanyUser:
        res = Res_CompanyUser()
        company_uuid = uuid.UUID(company_id)
        user_uuid = uuid.UUID(user_id)

        err_type, _ = await self._fetch_managed(company_uuid, user_uuid)
        if err_type != ErrorType.SUCCESS:
            res.result.SetResult(err_type)
            return res

        data = req.model_dump(exclude_unset=True)
        if data.get("status") is not None:
            s = data["status"]  # pydantic 은 enum 멤버로 돌려준다 → SMALLINT 값으로 환원
            data["status"] = s.value if isinstance(s, UserStatus) else int(s)
        if data.get("password"):
            data["password"] = await GetHashedPW(data["password"])
        else:
            data.pop("password", None)  # 빈 비밀번호는 변경하지 않음

        err_type = await DB_SESSION_MNG.execute_lambda_run(
            [users.DBType()],
            [lambda s: self.user_crud.update_user(s, user_uuid, data)],
        )
        if err_type != ErrorType.SUCCESS:
            res.result.SetResult(err_type)
            return res

        return await self.get_user(company_id, user_id)

    async def delete_user(self, company_id: str, user_id: str) -> Res_DeleteCompanyUser:
        res = Res_DeleteCompanyUser()
        company_uuid = uuid.UUID(company_id)
        user_uuid = uuid.UUID(user_id)

        err_type, _ = await self._fetch_managed(company_uuid, user_uuid)
        if err_type != ErrorType.SUCCESS:
            res.result.SetResult(err_type)
            return res

        err_type = await DB_SESSION_MNG.execute_lambda_run(
            [users.DBType()],
            [lambda s: self.user_crud.update_user(s, user_uuid, {"deleted": True, "updated_at": GTime.UTC()})],
        )
        if err_type != ErrorType.SUCCESS:
            res.result.SetResult(err_type)
        return res